157721506464 has 96 divisors (see below), whose sum is σ = 421343790336. Its totient is φ = 51651624960.

The previous prime is 157721506463. The next prime is 157721506477. The reversal of 157721506464 is 464605127751.

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (157721506463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1213929 + ... + 1337559.

It is an arithmetic number, because the mean of its divisors is an integer number (4388997816).

Almost surely, 2^157721506464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 157721506464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210671895168).

157721506464 is an abundant number, since it is smaller than the sum of its proper divisors (263622283872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

157721506464 is a wasteful number, since it uses less digits than its factorization.

157721506464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123878 (or 123870 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 48.

The spelling of 157721506464 in words is "one hundred fifty-seven billion, seven hundred twenty-one million, five hundred six thousand, four hundred sixty-four".